SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2017-7660

It is possible to create a specially crafted node name that does not exist as part of the cluster and point it to a malicious node.

HIGH 7.5EPSS 5.63%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (5.63%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

Apache Solr uses a PKI based mechanism to secure inter-node communication when security is enabled. It is possible to create a specially crafted node name that does not exist as part of the cluster and point it to a malicious node. This can trick the nodes in cluster to believe that the malicious node is a member of the cluster. So, if Solr users have enabled BasicAuth authentication mechanism using the BasicAuthPlugin or if the user has implemented a custom Authentication plugin, which does not implement either "HttpClientInterceptorPlugin" or "HttpClientBuilderPlugin", his/her servers are vulnerable to this attack. Users who only use SSL without basic authentication or those who use Kerberos are not affected.

CVSS 3.0
7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
5.63% probability · 93th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-287
Affected
apache/solr
Source
security@apache.org
EPSS trend
0%5%10%27 October 2026: 5.63%27 October 202627 October 2026

EPSS 5.6% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.